Composition board and process of producing same.



- coo tors, etc.

T FFIQ.

HAROLD L HOLLISTER', OF WEST MINNEAPOLIS, MINNESOTA.

COMPOSITION BOABD AND PROCESS QF PRODUCING SAME.

To all whom it may concern:

Be it known that I, HAROLD L. HOLLIS- TER, a citlzen of the United States, residing at West Minneapolis, in the county of Hennepin and State oi Minnesota, have invented certain new and useful Improvements in Composition Boards and Processes of Producing Same; "and I do hereby declare the following to be a full, clear, and exact description of the ihvention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has for its object the production of a new and improved composition .board or'material, and also includes an improved process of making the same. ("7

The-improved product is made from finely ground straw, tar pitch, glue and molasses. I have produced a highly satisfactory product by the use of the materials above noted, in the following porportions, to-wit; ground straw, three-fourths; tar pitch, onesixth; glue,.one-twenty-fourth; and molasses one-twenty-fourth The improved process by which this roduct has in practice been produced 'is as iollows: First, the straw is ground up; the

glue and molasses are mixed and heated;

and the ground straw is then thoroughly stirred into the same. Then the tar pitch 1s added and thoroughly commingled with the mixture of molasses, glue and straw. As the final step, the above mixture is spread out and pressed to shape or otherwise given the desired form, and is dried.

Composition material of this kind, when made into boards or thin strips, makes the most satisfactory building material, and is especially adapted for use as sheathing. It has a high insulating uality, and hence is ada ted for use in making ice chests, fireless Furthermore, this improved artificial board or material may be produced Specification of Letters Patent. Application filed June 18,1908. Serial No. 439,117. I

" Patented March 23, 1909.

at comparatively smallcost. Also it has the further advantage that it is practically fireproof. It will remain intact unless subjected .to very high-temperature. Even under extremely high temperatures it is an extremely slow burning material and must, in

fact, melt before it will burn.

What I claim is: 1. As a new article of manufacture, a composition board composed of ground straw, tar pitch, glue and molasses.

' 2. As a new article of manufacture, a composition board composed of approirimately three-fourths ground straw, one-sixth tar pitch, one-twenty-fourth glue and onetwenty-fourth molasses.

3. The process of producing composition board, whichiconsists first in" grinding straw; -second, in heating glue and molasses and mixing the same; third, in stirring the ground straw into the mixture of glue and molasses; fourth, in stirring into the mixture tar pitch; and fifth, in giving the material the desired form and drying the same.

4. The process of producing composition In testimony whereof I aflix my signature in presence of two witnesses.

\ HAROLD I). I-IOLLISTER.

Witnesses HARRY D. KILGORE,

MALIE HOEL. 

